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Joint Study on Non-Accelerator Physics [LVD+LMD]

非加速器物理联合研究 [LVD LMD]

基本信息

批准号：
06044150
负责人：
WADA Tomonori
金额：
$ 4.99万
依托单位：
Okayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06044150/
关键词：
Large Volume Detector (LVD)Iiquid scintillator Gran Sasso Laboratory TL-sheet Cosmic neutrinos GUT monopole Large area Massive particle Detector (LMD)Super-slow Massive particles Steller collapse signals

项目摘要

1. The Large Volume Detector (LVD) in the Gran Sasso underground Laboratory is a multipurpose detector consisting of a large volume of liquid scintillator interleaved with limited streamer tubes in a compact 3-dimensional geometry. A major purpose of the LVD neutrino observatory is to search for stellar collapses. The detector has a modular structure composed of 190 modules arranged in 5 towers. Each modules has 8 scintillation counters surrounded by an L-shaped tracking system. The total mass is 1840 tons of scintillator and the dimensions are 40m*12m*13m. Presently the first tower is taking data and the second and third are under construction. The first tower (368 tons) was turned on in June 1992. This mass of liquid scintillators makes the first LVD tower one of the largest supernova neutrino observatories in the world and the largest one based on liquid scintillator.The LVD group presents the power of LVD to study lowenergy neutrinos and a search for stellar collapse signals. The first results were obtained from the combined measurements of the EAS-TOP (at the surface of Gran Sasso) and LVD (deep underground) detectors operating as a combined telescope in the study of UHE cosmic rays and their interactions. As examples, different classes of events and their significance in different high-energy and astrophysical were studied.2. A thermoluminescent [TL] sheet and its readout system have been developed for the detection of supper-slow massive particles. From the results of lower energy ion experiments the TL-sheet has an efficiency for slow velocity (beta<10^<-3>) ions. The TL-sheet stacks of the 40m^2 were set at the Mont Blanc tunnel for two years. The X-ray films of 40*8m^2 were analyzed. Three candidated were found from X-ray film analyzes. Their TL-sheets have been read out and searched for slow GUT monopoles or not.

1. Gran Sasso地下实验室的大体积探测器（LVD）是一种多用途探测器，由大量液体闪烁体和有限的流光管组成，呈紧凑的三维几何形状。LVD中微子天文台的一个主要目的是寻找恒星坍缩。探测器采用模块化结构，由190个模块组成，排列在5个塔中。每个模块有8个闪烁计数器，周围有一个L形跟踪系统。总质量为1840吨闪烁体，尺寸为40 m * 12 m * 13 m。目前，第一座塔正在收集数据，第二座和第三座塔正在建设中。第一座塔（368吨）于1992年6月启用。LVD塔是世界上最大的超新星中微子观测站之一，也是世界上最大的基于液体闪烁体的中微子观测站。LVD小组展示了LVD在研究低能中微子和寻找恒星坍缩信号方面的能力。第一批结果是从EAS-TOP（在Gran Sasso表面）和LVD（地下深处）探测器的联合测量中获得的，它们作为一个联合望远镜在UHE宇宙射线及其相互作用的研究中运作。作为例子，研究了不同类别的事件及其在不同高能和天体物理中的意义。2.研制了一种热释光片及其读出系统，用于大质量超慢粒子的探测。从较低能量离子实验的结果来看，TL片对低速（β <10 μ m）离子具有效率<-3>。40 m^2的TL板堆在勃朗峰隧道中放置了两年。分析了40*8m^2的X线片。X线片分析发现3个候选者。他们的TL表已经读出，并搜索缓慢的GUT单极或没有。